Recoil amplifier device



Feb. 12, 1952 A. F. c. HENCKEL 2,585,775

RECOIL AMPLIFIER DEVICE Filed July 25, 1946 2 SHEETS-SHEET l Qq mm. 944;@Mm Qua AT-rvs.

Feb. 12, 1952 A. F. c. HENCKEL RECOIL AMPLIFIER DEVICE 2 SHEETS-SHEET 2Filed July 25, 194

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m M 9... RTT'ys Patentecl Feb. 12, 1 952 Aage Frederik ChristianHenckel, Hellerup, Denmark Application July 25, 1946, Serial No. 686,236In Denmark April 30, 1946 3 Claims.

The invention relates to a recoil amplifying device for automaticfirearms with interchangeable barrel.

In later types of such arms, the barrel jacket is open on top, and thechange of barrel is effected in such manner that, being connected to thefront part of the receiver by a sort of bayonet joint or in like manner,the barrel is turned initially by means of handle attached to the barrelat a certainangle around its axis, until there is no connection betweenthe barrel and the receiver, and next the barrel is drawn forwards andfree of the receiver, after which it is finally removed.

It has hitherto not been practicable to change a barrel in this mannerby automatic firearms with recoil amplifiers, inasmuch as the latter,forming the front bearing of the barrel, has until now always beenrigidly connected to the jacket, whereby it prevented the rear of thebarrel from being raised.

This drawback has been remedied by the recoil amplifier according to theinvention, as in accordance hereto the recoil amplifier is equipped atits rear with two horizontal pivots arranged diametrically opposite oneanother, by which pivots it rests in bearings in front extensions of thesidewalls of the barrel jacket.

Preferably the pivots of the recoil amplifier and their bearings in theextensions of the sidewalls of the barrel jacket are so designed that,besides offering a safe mounting of the amplifier for turning downwardlyrelative to the barrel jacket, so as to admit the extraction of thebarrel when a change of barrel has to be effected, they will even makeit possible to disassemble the amplifier from the barrel jacket withoutany use of tools.

An example of construction for a recoil amplifier according to theinvention is illustrated on the drawing.

Figure 1 shows in side view, and partly in section, a recoil amplifiermounted on the front part of the barrel jacket of an automatic firearmand also shows further parts of the barrel section of the firearm,

Figure 2 shows the recoil amplifier and the front part of the barreljacket, in top View,

Figure 3 shows chiefly the same parts as shown in Figure l, but inposition for extracting the barrel from the recoil amplifier, and

Figure 4 shows a cross section along lines IV--IV in Figures 1 and 2.

On the drawing, I is the barrel of an automatic firearm, H the barreljacket and I2 the recoil amplifier. The barrel is bayonet locked in thereceiver l3 and has a handle [4 by means of 2 which it may be turnedaround its axis for undoing the bayonet lock, whereafter it is movedforward, free of the receiver. The barrel jacket .is open on top,allowing the barrel to be lifted out of the jacket. The amplifier isconnected to the barrel jacket and forms a foremost bearing for thebarrel. The connection between the amplifier and the barrel is asfollows:

The amplifier has two horizontal, lateral pivots :5 arrangeddiametrically opposite one another and resting in bearings [6 in frontextensions 11 of the sidewalls of the barrel jacket. The bearings i 6are so placed with respect to the forward end of the barrel jacket Hthat when the recoil amplifier I2 is pivoted by means of lateral pivotsi5 in the bearings, only a small space 20 is left between said frontface 18 of the barrel jacket and the rear face IQ of the amplifier. Therecoil amplifier I2 is thus permitted to pivot with respect to saidbarrel jacket il around the pivots 15, which are positioned in thebearings ['8 which are formed in slots in the front end of the barreljacket.

The barrel If), after having been turned around its axis in order todisengage the bayonet lock, and having then been moved forward angularlywith respect to the barrel jacket I I in order that it may be disengagedfrom the receiver, may then be turned on the pivots l 5 of the recoilamplifier 12 to a position shown in Figure 3, in which the barrel can befreely withdrawn from the recoil amplifier, in no manner whateverobstructed by the receiver. When the barrel has been removed in thisway, the amplifier will be positioned with its rear face I9 abuttingagainst the front face l8 of the lower wall of the jacket, ready to havea fresh barrel inserted, which latter may next be lowered into thebarrel jacket, thereafter carried back into the receiver and finallyturned to be locked in the latter. I

In the example shown on the drawing, the lateral pivots I5 of the recoilamplifier are not fully cylindrical but somewhat flattened at the rearside, whereby each of the said pivots projects only approximatelyhalfway into its bearings IS in the sidewall extension ll. At a shortdistance behind the bearings 16, another pair of bearings 2| isconnected to the first named bearings through passage 22, reduced frombelow to a total height corresponding to the smallest diameter of theflattened pivots. From each of the bearings 2| to the top side of thewall extensions I! there is at the inner side of said extensions agroove 23 of a depth corresponding to the length of the pivot l5. Thusit will be seen that, when the barrel is extracted from the recoilamplifier in the manner explained above, and the amplifier thereafterhas been turned around its pivots in the bearings I6 to an uprightposition, the amplifier may be carried backwards With its pivots throughthe passages 22 to the rearmost bearings 2|, and from there upwardsthrough the grooves 23 and removed from the barrel j acket, whichremoval may be desirable for cleaning purposes.

Having thus described my invention, what I claim is:

1. In an automatic firearm includinga recoil amplifier, a barrel jacket,and a barrel removably locked in said barrel jacket butreadily'removable therefrom by disengaging the *locking means holdingsaid barrel in said barrel jacket, rotating said barrel through ananglewith-reference to said barrel jacket, and withdrawing said barrelfrom said firearm by axial movement of said barrel, the combination withsaid barrel jacket of a recoil amplifier pivota1ly-jointed to saidbarrel jacket attheforward end thereof, said jacent the rearward end'ofsaid recoil amplifier =-so that it may be rotated at an angle withreference to said barreljacketaround said pivots when said. barrel isbeing removed from said barrel 'jacketand'"said-recoil amplifier, theconnection between the end of'said barrel positioned within saidamplifier being substantially that of one cylinder closely embracinganother cylinder, "whereby recoil energy is more effioientlycommunicated from said amplifier to said barrel, and heat is morereadily transferred between said last-mentioned 'members.

Inan automatic firearm including a recoil "amplifier, a barrel jacket,and a barrel removably locked in said barrel jacket but readilyremovable therefrom by disengaging the locking means holding said barrelin said'barrel jacket, rotating said barrel" through an angle withreference to said barrel jacket, and withdrawing said barrel from" saidfirearm by axial movement of said bar- 'rel, the'combination with saidbarrel jacket of a recoihamplifieri pivota'lly jointed to-said barreljacket at the forward end thereof, said recoil amplifier being providedadjacent the rearward portion thereof with a pair of horizontallyextending Tpivotspositioned 'on opposite sides ofsaidrecoil amplifier,and aplurality of bearings for said ,"pivots'positioned'in the forwardend-of said barrel jacket,"saidpivotsbeing adapted to rotate in saidbearingsfwhereby said recoil amplifier maybe rotatedwith" respect tosaid barrel jacket around "'the'axis of said pivots to permit readyremoval of said'barrelfrQm" said barrel jacket and saidre-'coilam'plifier, the connection betweenthe end of said barrel positionedwithin said amplifier being substantially that of one cylinder closelyem-' bracing another cylinder, whereby recoil energy is more'etficiently 'communicated fromsaid am- 'means holding said barrellainsaid barrel jacket, rotating saidbarrel through an angle with referenceto said barrel jacket, and withdrawing said barrel from said firearm byaxial movement of 1 said-barrel, the combination with said barrel jacketof a recoil amplifier pivotally secured to said barrel jacket at theforward end thereof, said recoil amplifier being provided, adjacent itsrearward.portion, with a pair of horizontally extending pivotspositioned on opposite sides of said recoil amplifier, said pivots beingflattened on the side thereof nearest the rearward portions of saidfirearm so that one cross-sectional diameter thereof is lessxini extentthan the cross sec- 'tional'rzdiameter'o'f saidpivotsbetween-unflattened portions thereof, said barrel jacket-beingprovidedzat the forward send;v thereof with a'pair of interconnectedbearings for each of saidpivot v:pins,::one spair: being positioned on;each side, of

said'barrel jacket, and the bearings on each'side of said. barrel jacketbeingzarranged axially of said: barrel: jacket, and in communicationwith -each otherithrough an :opening which is larger 1 than thelesserdiameterof said pivots but smaller than thegreater diameter ofsaid pivots, there beingalso provided in' said: barrel j acket, aboveeach i of 's'aid'rearmost bearings "off each pairroneach sideof; saidbarrel jacket, ran opening'in theupper" surface of said barrel jacketthrough which said pivots may be sdrawn thus facilitating. removal ofsaid: recoil amplifier from. said. barrel jacket," said recoilamplifier: being adapted, when said pivots are in the forward bearingsof each 1 pair on each side of said barrel'jacket, to rotate 1 aroundthe axis of said pivots withreference to said barrel jacket, therebypermitting removal of said: barrel from said barrel jacket andusaidrecoil amplifier. r a AAGE FREDERI-K CHRISTIAN HENCKEL.

REFERENCES CITED Ihe 'following references are of record inth file of.this patent:

UNITED STATES; PATENTS Number Name Date 2,149,707 Murbach Mar. '7, 193922,163,144 'Halek June-20,1939

FQREIGN PATEN TS Number Country Date 615,736 Germany July 12, 1935381,747 ,Great Britain Oct. 13, 1932 383,754 .Great Britain Nov. 24,1932

